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NEET Sample Paper NEET Sample Test Paper-83

  • question_answer
    A gramophone record is revolving with an angular velocity\[\omega \]. A coin is placed at a distance r from the centre of the record. The static coefficient of friction is \[\mu \] The coin will revolve with the record, if

    A)  \[r=\mu g{{\omega }^{2}}\]                

    B)  \[r<\,\,\frac{{{\omega }^{2}}}{\mu g}\]

    C)  \[r\le \,\,\frac{\mu g}{{{\omega }^{2}}}\]                     

    D)  \[r\ge \,\,\frac{\mu g}{{{\omega }^{2}}}\]

    Correct Answer: C

    Solution :

    The coin will revolve with the record, If force of friction \[\ge \] centrifugal force \[\mu mg\ge \,\,mr{{\omega }^{2}}\,\,\Rightarrow \,\,r\,\,\le \,\,\frac{\mu g}{{{\omega }^{2}}}\]


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